Drainage works costing £200,000 will be carried out on the slope at Kex Gill on the A59 for six weeks starting Monday February 24.
Unprecedented rainfall since 2012 has been cited as the reasoning behind the works which will supplement those carried out in 2011.
Temporary lights will maintain traffic flow on the A59 and a 40 mph speed limit will be applied.
Some councillors have suggested that, though the works are necessary given the importance of the road, the only way to solve the long-term problem is a bypass which will require government investment.
Executive member for highways, County Councillor Gareth Dadd, said: “We apologise for any inconvenience that this may cause to road users; however, the works are necessary to enhance the stability of the slope at Kex Gill.”
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